Christophe,
I would not worry so much about the interface as much as the functionality. It sounds like you know the specs you need in a camera (resolution, bit depth, frame rate). Find out what camera/interface combinations are out there that meet all your requirements, and purchase the one that is most cost effective. Don't pay extra for features that you won't use, such as the 25 f/s on the camera link board.
I would talk to Robert Eastlund at Graftek Imaging (800) 441-2118 about selecting a camera. He distributes a large variety of the cameras that work with IMAQ, and will be able to advise you on the best camera for your application.
Bruce
Bruce Ammons
Ammons Engineering